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(+7)(Y+3)=1
We move all terms to the left:
(+7)(Y+3)-(1)=0
We add all the numbers together, and all the variables
7(Y+3)-1=0
We multiply parentheses
7Y+21-1=0
We add all the numbers together, and all the variables
7Y+20=0
We move all terms containing Y to the left, all other terms to the right
7Y=-20
Y=-20/7
Y=-2+6/7
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